Mathematics>Standard Multiple Choice

Read the following SAT test question and then click on a button to select your answer.

v=152-9.8t

A volcanologist modeling a volcanic eruption determines that vertical velocity, v, in meters per second (m/s), of the debris reaching the highest altitude t seconds after the eruption can be given by the equation above. Which of the following is the best interpretation of 152 in this context?

A.The velocity changed by 152 m/s every second.

B.The highest altitude reached by debris was 152 meters.

C.The debris hit the ground 152 seconds after the eruption.

D.The debris had a vertical velocity of 152 m/s at the time of eruption.

答案：B

解析：Choice D is correct.

 

 

重点词汇：

volcanologist [,vɔlkən'ɔlədʒist] n. 火山学家

altitude ['æltɪtjuːd] n. 高地;高度;[数] 顶垂线;(等级和地位等的)高级

equation [ɪ'kweɪʒ(ə)n] n. 方程式，等式;相等;[化学] 反应式

interpretation [ɪntɜːprɪ'teɪʃ(ə)n] n. 解释;翻译;演出

velocity [vəˈlɒsəti] n. 【物】速度

altitude ['æltɪtjuːd] n. 高地;高度;[数] 顶垂线;(等级和地位等的)高级;海拔

debris [ˈdeɪbri:] n. 碎片，残骸

vertical ['vɜːtɪk(ə)l] n. 垂直线，垂直面 adj. 垂直的，直立的;[解剖] 头顶的，顶点的

velocity [vəˈlɒsəti] n. 【物】速度